Design Guidelines: Plastic Injection Moulding

Our basic guidelines for plastic injection moulding include important design considerations to help improve part mouldability, enhance cosmetic appearance, and reduce overall production time.

We offer a number of secondary moulds and tooling services to support your project.


 Size

SIZE

480mm x 770mm

VOLUME

966,837 mm³ 

DEPTH

101mm from parting line with 3° of draft

Up to 202mm if the parting line can pass through the middle of the part
Projected Mould Area

112,903 mm²

 

Typically, Proto Labs can maintain a machining tolerance of +/- 0.08mm with an included resin tolerance that can be greater than but no less than +/- 0.005mm

an applications engineer examines a prototype part

Design Feedback
For additional questions, please contact a Customer Service Engineer at customerservice@protolabs.co.uk  or +44 (0) 1952 683 047


Materials

  • ABS
  • ABS/PC
  • Acetal
  • Acetal Copolymer
  • Acetal Homopolymer
  • ETPU
  • HDPE
  • LCP
  • LDPE
  • LLDPE
  • Nylon 6
  • Nylon 5/12
  • PBT
  • PC/PBT
  • PEEK
  • PEI
  • PET
  • PETG
  • PMMA
  • Polycarbonate
  • Polypropylene
  • PPA
  • PPE/PS
  • PS

VIEW MATERIALS >


Surface Finishes

FINISH DESCRIPTION
PM-F0 non-cosmetic, default

PM-F1

low-cosmetic, most toolmarks removed
SPI-C1 600 grit stone, 10-12 Ra
PM-T1 SPI-C1 + light bead blast
PM-T2 SPI-C1 + medium bead blast
SPI-B1 600 grit paper, 2-3 Ra
SPI-A2 grade #2 diamond buff, 1-2 Ra

 

adding surface finish to a mold


Draft

VERTICAL FACES
0.5°
MOST SITUATIONS
MINIMUM FOR SHUT OFF
MINIMUM FOR LIGHT TEXTURE (PM-T1)
MINIMUM FOR LIGHT TEXTURE (PM-T2) 5°+


Undercuts

Maximum Side Core Dimensions

WIDTH HEIGHT

PULL

< 213.84mm <60.38mm <73.66mm


Wall Thickness

MATERIAL

RECOMMENDED WALL THICKNESS

ABS

1.143mm - 3.556mm

Acetal

0.762mm - 3.048mm

Acrylic 0.635mm - 12.7mm
Liquid Crystal Polymer 0.762mm - 3.048mm
Long-Fiber Reinforced Plastics 1.905m - 25.4mm
Nylon 0.762mm - 2.921mm
Polycarbonate 1.016mm - 3.81mm
Polyester 0.635mm - 3.175mm
Polyethylene 0.762mm - 5.08mm
Polyphenylene Sulfide 0.508mm - 4.572mm
Polypropylene 0.635mm - 3.81mm
Polystynene 0.889mm - 3.81mm
Polyurethane 2.032mm - 19.05mm

 * The table is adapted from manufacturingcenter.com.


Radii

Some part corners will have a radius rather than a sharp edge since we use an automated CNC milling process to make the mould for your parts. This typically does not require a change to your model, but resulting radii are identified before the mould is milled.


press operator examines part

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